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  <div class="section" id="numpy-seterr">
<h1>numpy.seterr<a class="headerlink" href="#numpy-seterr" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="numpy.seterr">
<code class="sig-prename descclassname">numpy.</code><code class="sig-name descname">seterr</code><span class="sig-paren">(</span><em class="sig-param">all=None</em>, <em class="sig-param">divide=None</em>, <em class="sig-param">over=None</em>, <em class="sig-param">under=None</em>, <em class="sig-param">invalid=None</em><span class="sig-paren">)</span><a class="reference external" href="https://github.com/numpy/numpy/blob/v1.18.1/numpy/core/_ufunc_config.py#L39-L136"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#numpy.seterr" title="Permalink to this definition">¶</a></dt>
<dd><p>Set how floating-point errors are handled.</p>
<p>Note that operations on integer scalar types (such as <code class="xref py py-obj docutils literal notranslate"><span class="pre">int16</span></code>) are
handled like floating point, and are affected by these settings.</p>
<dl class="field-list">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><dl>
<dt><strong>all</strong><span class="classifier">{‘ignore’, ‘warn’, ‘raise’, ‘call’, ‘print’, ‘log’}, optional</span></dt><dd><p>Set treatment for all types of floating-point errors at once:</p>
<ul class="simple">
<li><p>ignore: Take no action when the exception occurs.</p></li>
<li><p>warn: Print a <em class="xref py py-obj">RuntimeWarning</em> (via the Python <a class="reference external" href="https://docs.python.org/dev/library/warnings.html#module-warnings" title="(in Python v3.9)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">warnings</span></code></a> module).</p></li>
<li><p>raise: Raise a <em class="xref py py-obj">FloatingPointError</em>.</p></li>
<li><p>call: Call a function specified using the <a class="reference internal" href="numpy.seterrcall.html#numpy.seterrcall" title="numpy.seterrcall"><code class="xref py py-obj docutils literal notranslate"><span class="pre">seterrcall</span></code></a> function.</p></li>
<li><p>print: Print a warning directly to <code class="docutils literal notranslate"><span class="pre">stdout</span></code>.</p></li>
<li><p>log: Record error in a Log object specified by <a class="reference internal" href="numpy.seterrcall.html#numpy.seterrcall" title="numpy.seterrcall"><code class="xref py py-obj docutils literal notranslate"><span class="pre">seterrcall</span></code></a>.</p></li>
</ul>
<p>The default is not to change the current behavior.</p>
</dd>
<dt><strong>divide</strong><span class="classifier">{‘ignore’, ‘warn’, ‘raise’, ‘call’, ‘print’, ‘log’}, optional</span></dt><dd><p>Treatment for division by zero.</p>
</dd>
<dt><strong>over</strong><span class="classifier">{‘ignore’, ‘warn’, ‘raise’, ‘call’, ‘print’, ‘log’}, optional</span></dt><dd><p>Treatment for floating-point overflow.</p>
</dd>
<dt><strong>under</strong><span class="classifier">{‘ignore’, ‘warn’, ‘raise’, ‘call’, ‘print’, ‘log’}, optional</span></dt><dd><p>Treatment for floating-point underflow.</p>
</dd>
<dt><strong>invalid</strong><span class="classifier">{‘ignore’, ‘warn’, ‘raise’, ‘call’, ‘print’, ‘log’}, optional</span></dt><dd><p>Treatment for invalid floating-point operation.</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><dl class="simple">
<dt><strong>old_settings</strong><span class="classifier">dict</span></dt><dd><p>Dictionary containing the old settings.</p>
</dd>
</dl>
</dd>
</dl>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<dl class="simple">
<dt><a class="reference internal" href="numpy.seterrcall.html#numpy.seterrcall" title="numpy.seterrcall"><code class="xref py py-obj docutils literal notranslate"><span class="pre">seterrcall</span></code></a></dt><dd><p>Set a callback function for the ‘call’ mode.</p>
</dd>
</dl>
<p><a class="reference internal" href="numpy.geterr.html#numpy.geterr" title="numpy.geterr"><code class="xref py py-obj docutils literal notranslate"><span class="pre">geterr</span></code></a>, <a class="reference internal" href="numpy.geterrcall.html#numpy.geterrcall" title="numpy.geterrcall"><code class="xref py py-obj docutils literal notranslate"><span class="pre">geterrcall</span></code></a>, <a class="reference internal" href="numpy.errstate.html#numpy.errstate" title="numpy.errstate"><code class="xref py py-obj docutils literal notranslate"><span class="pre">errstate</span></code></a></p>
</div>
<p class="rubric">Notes</p>
<p>The floating-point exceptions are defined in the IEEE 754 standard <a class="reference internal" href="#r4cab4292821f-1" id="id1">[1]</a>:</p>
<ul class="simple">
<li><p>Division by zero: infinite result obtained from finite numbers.</p></li>
<li><p>Overflow: result too large to be expressed.</p></li>
<li><p>Underflow: result so close to zero that some precision
was lost.</p></li>
<li><p>Invalid operation: result is not an expressible number, typically
indicates that a NaN was produced.</p></li>
</ul>
<dl class="citation">
<dt class="label" id="r4cab4292821f-1"><span class="brackets"><a class="fn-backref" href="#id1">1</a></span></dt>
<dd><p><a class="reference external" href="https://en.wikipedia.org/wiki/IEEE_754">https://en.wikipedia.org/wiki/IEEE_754</a></p>
</dd>
</dl>
<p class="rubric">Examples</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">old_settings</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">seterr</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="s1">&#39;ignore&#39;</span><span class="p">)</span>  <span class="c1">#seterr to known value</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">seterr</span><span class="p">(</span><span class="n">over</span><span class="o">=</span><span class="s1">&#39;raise&#39;</span><span class="p">)</span>
<span class="go">{&#39;divide&#39;: &#39;ignore&#39;, &#39;over&#39;: &#39;ignore&#39;, &#39;under&#39;: &#39;ignore&#39;, &#39;invalid&#39;: &#39;ignore&#39;}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">seterr</span><span class="p">(</span><span class="o">**</span><span class="n">old_settings</span><span class="p">)</span>  <span class="c1"># reset to default</span>
<span class="go">{&#39;divide&#39;: &#39;ignore&#39;, &#39;over&#39;: &#39;raise&#39;, &#39;under&#39;: &#39;ignore&#39;, &#39;invalid&#39;: &#39;ignore&#39;}</span>
</pre></div>
</div>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">int16</span><span class="p">(</span><span class="mi">32000</span><span class="p">)</span> <span class="o">*</span> <span class="n">np</span><span class="o">.</span><span class="n">int16</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="go">30464</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">old_settings</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">seterr</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="s1">&#39;warn&#39;</span><span class="p">,</span> <span class="n">over</span><span class="o">=</span><span class="s1">&#39;raise&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">int16</span><span class="p">(</span><span class="mi">32000</span><span class="p">)</span> <span class="o">*</span> <span class="n">np</span><span class="o">.</span><span class="n">int16</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
  File <span class="nb">&quot;&lt;stdin&gt;&quot;</span>, line <span class="m">1</span>, in <span class="n">&lt;module&gt;</span>
<span class="gr">FloatingPointError</span>: <span class="n">overflow encountered in short_scalars</span>
</pre></div>
</div>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">OrderedDict</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">old_settings</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">seterr</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="s1">&#39;print&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">OrderedDict</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">geterr</span><span class="p">())</span>
<span class="go">OrderedDict([(&#39;divide&#39;, &#39;print&#39;), (&#39;over&#39;, &#39;print&#39;), (&#39;under&#39;, &#39;print&#39;), (&#39;invalid&#39;, &#39;print&#39;)])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">int16</span><span class="p">(</span><span class="mi">32000</span><span class="p">)</span> <span class="o">*</span> <span class="n">np</span><span class="o">.</span><span class="n">int16</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="go">30464</span>
</pre></div>
</div>
</dd></dl>

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